This zoomable sunburst visualization displays a hierarchical dataset of restaurant categories across multiple cities, using concentric rings to represent nesting levels. Built with D3 v5, it renders as SVG with animated transitions triggered by clicking any arc to zoom into that subtree. The code loads data from the `@observablehq/flare` module and applies `d3.partition` with a radial layout, while `d3.arc` and `transition.attrTween` handle the smooth path interpolations between zoom states. Color is assigned via `d3.scaleOrdinal` with an interpolated rainbow palette.